Automatic Compensation Sealed Packing Box

Abstract

The invention provides an automatic-compensating sealing packing box and belongs to the technical field of oil field machines. The packing box comprises a sealing cover, a sealing shell, a compensating spring, a pressing plate, first centralizing packing, a first centralizing pressure piece, compensating packing, a second centralizing pressure piece, second centralizing packing and a sealing base. The compensating packing, the first centralizing packing and the second centralizing packing make close contact with a polished rod under continuous pressure of the centralized pressure pieces, the sealing effect is improved, and packing abrasion can be compensated continuously. Lubricating oil is injected into a cavity, along with up and down motion of the polished rod, the lubricating oil seeps uniformly and stably, corrosion to the compensating spring is prevented, and the influence on the lubricating and sealing effects of the first centralizing packing and the second centralizing packing is avoided. All the parts are mutually matched in radial dimension, the eccentric wear problem is effectively solved, the service life of the packing box and the polished rod is greatly prolonged, and the energy-saving effect can be achieved. The packing box is simple in structure, low in cost and convenient to install and maintain, can be used as a wellhead sealing device individually, can also be taken as a following packing box to be used as an assembly of the wellhead sealing device, and is suitable for wells with various pressures.

Description

technical field [0001] The invention relates to an automatic compensation sealing packing box, which belongs to the technical field of oilfield machinery. Background technique [0002] The packing box is a sealing device used to seal the wellhead and the polished rod during the production process of the pumping unit in the oil field. However, due to the complex conditions of the pumping wells at the oil production site, the polished rod of the pumping unit is often worn away, thereby shortening the service life of the packing box. When there are scratches and corrosion on the surface of the polished rod, the wear of the packing box will be accelerated, resulting in oil leakage from the oil well, causing oil and steam leakage, and polluting the environment. [0003] Based on the field investigation of wells with severe packing wear and frequent replacement, combined with the analysis of single well production, the following reasons lead to serious wear: (1) Some wells have p...

AI Technical Summary

Problems solved by technology

However, due to the complex conditions of the pumping wells at the oil production site, the polished rod of the pumping unit is often worn away, thereby shortening the service life of the packing box

When there are scratches and corrosion on the surface of the polished rod, the wear of the packing box will be accelerated, which will lead to oil leakage in the oil well, resulting in oil leakage, steam leakage, and environmental pollution

[0003] Based on the field investigation of wells with severe packing wear and frequent replacement, combined with the analysis of single well production, the following reasons lead to serious wear: (1) Some wells have poor liquid supply capacity and low single well production. When the polished rod moves up and down, there is no Sufficient crude oil acts as a lubricant, dry grinding between the polished rod and the packing, and the damage of the packing is aggravated

(2) The head of the donkey, the polished rod and the wellhead are misaligned and not in a straight line, the polished rod of the pumping unit is deflected to one side, and eccentric wear occurs during operation

(7) The impact of the environment, sand and dust entering the gap between the polished rod and the packing, coupled with the high temperature climate, accelerates the wear and tear

In order to solve the problem of eccentric wear of the polished rod, someone designed a packing box that can move horizontally to hold the polished rod tightly. The disadvantage is that manual translation is required, and the packing box cannot follow the offset of the polished rod. The state of the root box holding the polished rod increases the friction force and the energy consumption of the pumping unit increases accordingly

In order to solve the problem of straightening the offset of the polished rod, someone proposed to use the universal ball to adjust the offset of the polished rod, but the universal ball can only adjust the inclination of the polished rod, but cannot adjust the translation of the polished rod, and the translation of the polished rod is common in practical applications. The problem

In order to solve the problem of eccentric wear of the polished rod, someone designed a follower device for the polished rod, but at the same time, the sealing problem of the follower device occurred, because rainwater, sewage or sand and dust are very easy to infiltrate at the same time, which will not only make the polished rod and the packing box The wear will increase, and it will cause corrosion to the polished rod and the packing box, seriously affecting its service life

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